Slumber 1 8-inch Mattress-in-a-Box: * Tight top bed mattress with individual spring coils * Revolutionary rebound technology lets the mattress-in-a-box expand in minutes when unpacked * Increased motion separation: springs provide undistributed rest * Slumber 1 spring mattress is constructed to adjust individually to your weight and body shape * Heavier gauge steel coil for durability and comfort with the Slumber 1 Mattress-in-a-Box * Twin Dimensions: 75 x 39 x 8 * Full Dimensions:75 x 54 x 8 * Queen Dimensions: 80 x 60 x 8 * King Dimensions: 80 x 76 x 8 * Beds sold separately. See our assortment of beds. * Bed frames sold separately. See our assortment of bed frames.